Coal-mining machine



(No Model.) 4 Sheets-Sheet 1. J. W. HARRISON.

COAL MINING MACHINE. No. 262,225. Patented Aug. 8, 1882.

N. PUERS. Fhololjlhugnphor. Washmgicn. D. C.

4 Sheets-Sheet 2'.

(No Model.)

7 J. W. HARRISON.

GOAL MINING MACHINE.

Patented Aug. 8, 1882.

4 SheetsSheet 3.

(No Model.)

J. W. HARRISON.

' GOAL MINING MACHINE. No. 262,225. Patented'Aug. 8, 1882.

(No Model.) 4 Sheets-Sheet 4.

J. W. HARRISON.

GOAL MINING MAGHINE. No. 262,225. Patented Aug. 8, 1882.

+7 ii- .HH 4" WW1 UNITED STATES PATENT UEETCE.

JONATHAN \V. HARRISON, OF RICHMOND, MICHIGAN, ASSIGNOB- TO GEORGE D."WHITCOMB, OF CHICAGO, ILLINOIS.

.COAL-MINING MACHINE.

SEEJIFICATION forming part of Letters Patent No. 262,225, dated August8, 1882.

Application filed September 3, 1881. (No model.)

To all whom it may concern:

Be it known that I, JONATHAN W. HARRI- SON, a citizen of the UnitedStates, residing at ltichmond, in the county of Macomb and State ofMichican, have invented Improvements in Goal-Mining Machines, of whichthe following is a specification.

This invention relates to improvements on the Harrison mining-machinedescribed in my former Letters Patent, granted the th December, 187 7,No. 19S,61.0,which improvements are intended to remedy certain defectsfound by continued practice to exist in the former machine.

My present improvement consists, first, in combining with amining-machine operated by compressed air or steam an upright rotaryengine of improved construction for operating the slide-valve; second,in a slide- 2'0 valve of peculiar construction, together with devicesfor changing the lead and amplitude of stroke of the valve; third, in animproved method of packing the piston; fourth, in a supporting and,guiding sleeve for the drillrod; fifth, in a locking and unlockingdevice for the supporting-wheels.

In the accompanying drawings, Figure 1 is a top view of the machine.Fig. 2 is a vertical longitudinal section, the end of the drill- 0 rodbeing broken off. Fig. 3 is a side view with one wheel removed. Fig. 4is a transverse section through the valve-engine with the pistonremoved. Fig. 5 is a top view of the slide-valve. Fig. 6 is a detachedview of 5 the right-and-left threaded screw. Fig. 7 is a view showingthree lengths 'of drill detached. Fig. 8 is a view showing threedifferent sizes of handle.

lis acylinder, supported bylugs 2 cast thereon, and carrying spindles onwhich revolve the Wheels 4. The extremities of the spindles are madesquare to rigidly support brackets 5, which are slotted to receiveadjustable handles 6, supported at rear by being passed through 5similar slots in the transverse bracket 7. The handles are adjustableforward and backward at pleasure, and may be fixed in any position towhich they are set by boltsSenteringholes 9.

The machine is held up to its work by ratchets 10 on the wheel 4 andpawls 11, pivoted to the brackets 7, and lifted out of engagement withthe ratchet, when it is desired to back the machine, by lever 12and cams13 on shaft 14. A stop or projection, 15, holds the lever 12 to Gillie!its protracted or retracted position.

The stand pipe16 is provided with ports 16 at both sides for receivingcompressed air or steam from either direction.

17 is the throttle-valve.

18 is the slide-chest, within which is the peculiarly-constructedslide-valve 19.

20 20 are ports for supplying air from the slide-chest to the cylinder,and 21 2t the exhaust-apertures communicating with the atmosphere at theside of the cylinder, as shown in dotted lines in Fig. 2.

The slide-valve consists of two portions, 10 19", the two parts beingjoined by right-andleft threaded screw 22. By turning this screw one wayor the other the distance between the parts 19" and 19 is increased orlessened at will, thus allowing the accurate regulating of the lead ofthe slide-valve. 0n the end 19 of the slide-valve are gibs 23 23,adjustable longitudinally between projections 24 24 by means of bolts 2525 and slots 26 26. The eccentric 27 for actuating the slidevalverevolves between these adjustable gibs, and it will readily be seen thatby setting the gibs nearer together the amplitude of movement of theslide-valve is increased, and by setting them farther apart themovementis lessened, while by adjusting them irregularly the cut-off at eitherend of the cylinder may be increased or lessened as desired.

The eccentric 27 is set on quarter-center on the vertical piston-rod 28of an upright rotary engine. Steam or compressed air is supplied to thechest 30 from the slide-chest 18 through port 31. The abutment 32 isheld by steam or air pressure constantly against the surface of therotary piston 33, the compressed air or steam entering the cylinder 34through ports 35 when the abutment is protracted sut- 5 ficiently toopen the same. A slide, 36, under the control of the operator, enablesthe closure of the exhaust-port 37 at pleasure, the closure of the saidport stopping the engine. Ports 37 37 in the cylinder connect with theexhaust, while ports 35 35 admit the steam or air under pressure fromthe chest 30. The wheel 38 is used to start the engine, and also servesas a fly-wheel.

The horizontal cylinder 1 is counter-bored slightly at 1 1, and moredeeply at 1 1. \Vithin these counterbored portions are cushions 38 38,made of two or more disks of steel or iron, each about one-half inchthick, having an interposed disk or disks ofrubber or leather, as shownin Fig. 2. At each end of the counterbored portions are shoulders 39 39,against which the cushions rest. Ports 4O aflord communication from thecounterbore in rear of the cushions to the slide-chestlS. These admitair or steam to the rear of the cushion in that end of the cylinder fromwhich air or steam is beingexhaustcd. throwing the cushion up againstthe shoulder 39. By this means I provide an air or steam cushion for thepiston-head in its next vibration and materially lessen the risk ofbursting the cylinder either by knocking off the head or by theexpansion of the cushions under the impact of the piston-head, while therubber or other soft packing material of which alternate disks of thecushions are composed, when under pressure, expands and produces aperfectly-tight packing around each cushion and around the piston-rod.

The piston-head 41 is held in place on the rod 42 by a pin, 43. Aroundthe head and covering both ends of the pin is apacking, 41. \Vith thepacking of common construction it has been necessary, when removing thepistonhead, to remove thepacking-ring before obtaining access to thepin. My improved packing is made with slots or apertures 44, so that onturning the packing-ring in its seat the head of the pin will beuncovered, allowing its removal without disturbing the packing.

The sleeve 45, supporting the rod 42, is held from rotation and set atany point desired by its teeth 46 gearing with similar teeth, 48, on anadjustable block, 47. The outer portion of the rod 42 is squareincross-section,as shown, and slides in a similarly-shaped bore in thesleeve 45.

To prevent the rotation of the drill 49 and consequent tightening of thekey common in the former machine, I make the drill with a tongue, 50, ofsquare or other non-circular cross-section, and fit it into asimilarly-shaped socket, 42, in the end of the rod 42. The drill is heldin place by a key, 51, passing through slots 52 52 in the rod 42 andtongue 50.

By these improvements the side sway of the machine, rapidly causingleakage, due to the old form of rotary engine, is avoided. The

eccentric being set on quarter-center, the engine does not have toperform any work while passing the dead center. I am not obliged to makethe eccentric ofa certain size, but make it larger than is necessary atfirst and take up wear by means of the sliding gibs 23. I am enabled tochange the lead of the valve so necessary in a case of this kind, thepiston-head invariably having a tendency, unless some such provision ismade, to strike one cushion harder than the other and to remain in oneend of the cylinder. The forms of cylinder and piston-head and cushionsprevent the bursting of the cylinder under a violent blow of the piston,and the wheel-locking devices are permanent and strong.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent:

1. In a reciprocating miningmachine operated by steam or compressed air,the con1- bination, with a slide-valve controlling the ports of thedrill-cylinder and a chest containing said valve and receiving steam orair directly from the boiler or reservoir, of a vertical rotary engineoperating said slide-valve by a cam on its piston-rod, and itself drivenby steam or air from the slide-box, as set forth.

2. The two-part slide-valve for reciprocating mining-engines, having itsends or shells joined by a right-and-left threaded screw for adjustingthe lead of the valve, and carrying independently-adjustable guides atone end for regulating the cut-off, substantially as shown anddescribed.

3. In combination with a circumfcrentiallygrooved piston-head and itsattaching-pin, the annular ring or packing filling the said groove,covering the end of the pin, and having cut-away portions or slots toallow ot' the removal of the head on shifting the packing, as set forth.

4. In a reciprocating mining-engine, the combination, with anon-circular drill-rod, of its supporting-sleeve projecting beyond thecylinder, having a similar non-circular bore, and mechanism, constructedas shown and described, applied directly to the said sleeve for allowingrotary adjustment through it to the drill-rod.

5. The wheel locking and unlocking device, consisting of ratchets l0,pawls 11, shaft 14. having eccentrics 13, and lever 12, combinedsubstantially as described.

SIMON Ii. HARRIS, GEORGE B. HARRIS.

ICC

